Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
5 Feb 2010
XBM80-2 video and PCB (draft)
A short video about the XBM80-2 80m CW micro-transceiver. This is built "ugly style" on a piece of copper clad board. It will get put in a box soon! I've also been having a go at a PCB (just 1 inch square - 25mm x 25mm).
Nice video, Roger. It would have been interesting if you had plugged the RX into a small amp so we could hear what it sounds like. Mine seems very shrill and there is almost no audio below 2KHz so even a strong signal tuned across the passband disappears within +/- 2KHz of the crystal frequency. Any idea what the trouble might be? I'm stumped.
Try increasing the value of the coupling cap into the base of TR2. I used a 0.1uF but a 0.47uF or 1uF might be better. I could do a video with my SINADDER attached so you can hear what it sounds like.
Nice video, Roger. It would have been interesting if you had plugged the RX into a small amp so we could hear what it sounds like. Mine seems very shrill and there is almost no audio below 2KHz so even a strong signal tuned across the passband disappears within +/- 2KHz of the crystal frequency. Any idea what the trouble might be? I'm stumped.
ReplyDeleteTry increasing the value of the coupling cap into the base of TR2. I used a 0.1uF but a 0.47uF or 1uF might be better. I could do a video with my SINADDER attached so you can hear what it sounds like.
ReplyDeleteGreat YouTube video roger.
ReplyDelete73 Tony G4LLW